Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Biodegradable bursting release system










Image Number 4 for United States Patent #5429822.

A biodegradable polymeric multiphasic release system of one or more biodegradable bursting units capable of delivering biologically active substances in a burst or pulse at predetermined times and a method for constructing those units is disclosed. The individual bursting units of the system may take the form of a biodegradable, membrane coated capsule surrounding a core material which may include an active agent. The membrane ruptures after a predetermined time upon exposure to water or bodily, or other aqueous environmental fluids. The bursting units may be used in any situation in which a controlled pulsed release of an active substance is desired. The predetermined time release of each bursting unit is controlled by the composition of the core material, the initial radius and wall thickness of the membrane and the porosity of the membrane. The core material may also contain a chemical composition which generates gas as fluid is drawn into the bursting unit thus adding an additional design variable for predetermining bursts.








 
 
  Recently Added Patents
Image forming apparatus, image forming method, and computer readable medium for identifying target-recording element using detection pattern
Display device and method of repairing display device
Projection illumination system for EUV microlithography
Magnetic levitation motor used in lens module
High surface area composition for use in the catalytic hydroconversion of a heavy hydrocarbon feedstock, a method making such composition and its use
Systems and methods for controlling registration of advancing substrates in absorbent article converting lines
Wind driven generator for vehicles
  Randomly Featured Patents
Rechargable flashlight
Electrical stenographic machine
System and method for reducing effects of rotational motion
Combined perfume bottle and cap
Method and apparatus to compensate for non-uniform film growth during chemical vapor deposition
Film brake applied by exposure initiation
Trash can receptacle
Handle assembly
Ink composition, inkjet recording method, printed material, and process for producing lithographic printing plate
Cover for use on a toaster